| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.atlas.utils; |
| |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| |
| public class MD5Utils { |
| |
| private static final ThreadLocal<MessageDigest> DIGESTER_FACTORY = |
| new ThreadLocal<MessageDigest>() { |
| @Override |
| protected MessageDigest initialValue() { |
| try { |
| return MessageDigest.getInstance("MD5"); |
| } catch (NoSuchAlgorithmException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| }; |
| |
| /** |
| * Create a thread local MD5 digester |
| */ |
| public static MessageDigest getDigester() { |
| MessageDigest digester = DIGESTER_FACTORY.get(); |
| digester.reset(); |
| return digester; |
| } |
| |
| private static final char[] HEX_DIGITS = |
| {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'}; |
| |
| public static String toString(byte[] digest) { |
| StringBuilder buf = new StringBuilder(MD5_LEN*2); |
| for (int i = 0; i < MD5_LEN; i++) { |
| int b = digest[i]; |
| buf.append(HEX_DIGITS[(b >> 4) & 0xf]); |
| buf.append(HEX_DIGITS[b & 0xf]); |
| } |
| return buf.toString(); |
| } |
| |
| public static final int MD5_LEN = 16; |
| } |